@article{MR_1979_15_a6,
     author = { },
     title = {\'{}E\ensuremath{\kappa}\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\sigma}\ensuremath{\eta} \ensuremath{\pi}\ensuremath{\varepsilon}\ensuremath{\pi}\ensuremath{\rho}\ensuremath{\alpha}\ensuremath{\gamma}\ensuremath{\mu}\ensuremath{\acute\epsilon}\ensuremath{\nu}\ensuremath{\omega}\ensuremath{\nu} \ensuremath{\acute\epsilon}\ensuremath{\tau}o\ensuremath{\upsilon}\ensuremath{\varsigma} 1974},
     journal = {M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta} E\ensuremath{\pi}\ensuremath{\iota}\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\acute\omega}\ensuremath{\rho}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta}},
     pages = {186--196},
     year = {1979},
     volume = {15},
     language = {gr},
     url = {http://geodesic.mathdoc.fr/item/MR_1979_15_a6/}
}